21655054106564 has 12 divisors (see below), whose sum is σ = 37897883421888. Its totient is φ = 10827087414600.

The previous prime is 21655054106551. The next prime is 21655054106617. The reversal of 21655054106564 is 46560145055612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109798832 + ... + 109995879.

It is an arithmetic number, because the mean of its divisors is an integer number (3158156951824).

Almost surely, 2^{21655054106564} is an apocalyptic number.

It is an amenable number.

21655054106564 is a deficient number, since it is larger than the sum of its proper divisors (16242829315324).

21655054106564 is a wasteful number, since it uses less digits than its factorization.

21655054106564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219819346 (or 219819344 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 21655054106564 in words is "twenty-one trillion, six hundred fifty-five billion, fifty-four million, one hundred six thousand, five hundred sixty-four".